ADC DRIVER SELECTION

Question

The ADC8021 is recommended as the driver for the AD7679. Could it be replaced with the AD8475 as differential driver no considering the Gain? thanks

JCCillion · Accepted Answer

Hi MaximMa123 , 
 I will move this thread to the proper forum. (+) ADC Drivers - EngineerZone (analog.com) Someone here may be better assist you. 
 Regards, 
 JC)

jeobico · Answer

Hi MaximMa123 , 
 The AD8475 (10nV/&radic;Hz) has higher noise voltage than AD8021(2.1nV/&radic;Hz). Lower noise is preferred as per the requirements stated on the Driver Amplifier Choice section. (page 17 of datasheet). There is a huge SNR degradation due to the amplifier with 10 nV/&radic;Hz noise density. However, we can suggest AD8138 as an alternative (5nV/&radic;Hz) if the application can tolerate more noise. 
 Regards, 
 JE

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ADC DRIVER SELECTION